Lifer, e.g.
Else clues• The Shawshank Redemption extra
• Beadsman, for one
• Bernie Madoff, until 11/14/2139?
• Big house resident
• Capone, from 1931 to 1939
• Capone, in the 1930s
• Cell body
• Cell dweller
• Cell occupant
• Cell-er?
• Con
• Confined con
• Convict
• Dungeon dweller
• Jailbird
• Joint tenant?
• Michael Clarke Duncan was one in The Green Mile
• Morgan Freeman, in The Shawshank Redemption
• One finishing a sentence
• One in a can
• One in the can
• One surrounded by cell walls
• One who may be stir crazy?
• One with a flight plan, maybe
• Pen dweller
• Pen pal?
• Person completing a sentence
• Person with conviction?
• Pokey person
• Poky resident
• Prison resident
• Prisoner
• San Quentin inhabitant
• Sentence completer
• Sentence finisher
• Sentence server
• Sing Sing resident
• Slammer resident
• Warden's ward
• Yardbird
• One of several resident of a dwelling (especially someone confined to a prison or hospital)
• A patient who is residing in the hospital where he is being treated
• A person serving a prison sentence